And it's just going to get more skewed until/unless TX left of the nation actually happens!
Unless the D margin in CA is cut in half and there’s a D collapse in New England and the Northeast by the late 2020s, I agree with this. TX will basically hold the key to any future realignment/seismic shift of electoral coalitions, not unlike the role it played as a bellwether in previous realignment periods (e.g. the Solid South, the 'New' R South). So much depends on whether it remains competitive-ish (with either a very slight D or, more likely, R lean) or whether it’s about where CA was at this point in 1986.
In terms of a state undergoing a really dramatic ideological shift, then UT going from one of the most reliably 60%+ R states in the nation to a progressive stronghold in little more than a decade or two would fit the bill even more than AK & HI and would arguably represent one of the most rapid electoral transitions in the nation's history.
